Scientia Agricultura Sinica ›› 2015, Vol. 48 ›› Issue (2): 262-269.doi: 10.3864/j.issn.0578-1752.2015.02.06

• TILLAGE & CULTIVATION·PHYSIOLOGY & BIOCHEMISTRY • Previous Articles     Next Articles

Solanum tuberosum L.; Correlation Among Endogenous Hormone Content, Threshold and Dormancy Periods in Processing Potato Varieties Minitubers During Storage

LIU Yue-shan, LI Cheng, WANG Dong-xia, XU Gang, WANG Yu-ping, CHENG Li-xiang, ZHANG Jun-lian, WANG Di, ZHANG Feng   

  1. Agronomy College, Gansu Agricultural University/Gansu Key Laboratory of Crop Improvement & Germplasm Enhancement/ Gansu Provincial Key Laboratory of Aridland Crop Science, Lanzhou 730070
  • Received:2014-03-04 Online:2015-01-16 Published:2015-01-16

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Abstract: 【Objective】The dormancy breaking and sprouting of processing potato varieties seed minituber are very important for potato production because of economic purpose. The relationship amongendogenous phytohormone levels, threshold values and dormancy periods were investigated under different storage temperatures and storage periods. The present researches will provide not only a technical parameter for storage, but also a suitable storage conditions for processing potato varieties seed minituber. 【Method】The contents of endogenous phytohormones GA3, IAA and ABA in seed minitubers were determined using HPLC after storage at three temperatures (4℃, 10℃ and 20℃) during 0-150 d. The effects of endogenous phytohormone levels on the processes of minituber dormancy breaking under different storage days and temperatures were analyzed. The linear relationship between the level of dynamic balance of endogenous phytohormone and the dormancy periods were deduced.【Result】The periods of dormancy breakage were significantly shorter in Shepody and Atlantic cultivars with the increase storage temperature from 4℃ to 10℃ and 20℃ throughout the storage period. The dormancy period of Atlantic was about 15 d shorter than Shepody under 10℃ and 20℃ storage. The contents of GA3 were significantly increased throughout storage period. After 150 d of storage, the contents of GA3 were increased by 1.7 and 1.9 times under 10℃, by 1.9 and 2.0 times under 20℃ compared to 4℃ in Atlantic and Shepody, respectively. The contents of IAA were significantly increased during 90-150 d. After 150 d of storage, the contents of IAA were significantly increased by 1.5 and 1.2 times under 10℃, by 1.9 and 1.5 times under 20℃ compared to 4℃ in Atlantic and Shepody, respectively. The contents of ABA were significantly decreased throughout the storage period. The levels of ABA were decreased by 7.2 and 6.4 times under 10℃, respectively. The ratios of (GA3+IAA)/ABA were significantly increased throughout the storage period. The correlation analysis indicated that there existed a strong positive linear relationship between the ratios of (GA3+IAA)/ABA and the percentage of sprouting minitubers during storage. The linear relationship showed that the threshold values of ratio of (GA3+IAA)/ABA were 52.02 and 48.49 in Shepody and Atlantic cultivars at time point of dormancy breakage, respectively. 【Conclusion】The result suggested that the changes in the level of dynamic balance of endogenous phytohormones GA3, IAA and ABA in minitubers were affected by the storage period and temperature. The threshold value of ratios of (GA3+IAA)/ABA and conclusions drawn can be an important technical parameter and can be used to control the minitubers dormancy breaking and sprouting in processing potato varieties.

Key words: dormancy period, endogenous hormone, seed minituber, threshold values

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